6x4 shed - should I be able to fit more in?

We have a garden shed in which we need to store 4 bikes (2 adults and 2 child sized), a rotary lawn mower and a roofbox (its a half sized one - so longer and thinner). Plus garden tools and a selection of kids toys like hula hoops / pop up tents etc. Should this all fit in ? We currently have the kids bikes in there but the adult ones don't seem to fit. I think that they all should / could with some reorganisation. Sadly my DH seems to take this as an affront to his manhood - so wondered if anyone else had this amount of stuff stored or any genius ideas we hadn't thought of (other than get another shed which is currently looking like the most realistic option).

Yes - my plan was to wait for a non rainy day, get all the stuff out and then re organise. DH is against this plan as he says it won't all fit. Was just hoping someone might have the same amount of stuff in the same sized shed and just be able to tell me it fitted, or have a photo of some amazing storage solution!